Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,...
Patent
1993-04-30
1994-10-25
Corbin, David H.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
138 97, 156294, 405156, 4051501, F16L 55165
Patent
active
053583590
ABSTRACT:
In a tube eversion apparatus having a chamber in which eversion pressure is produced, that pressure is controllably sealed by providing curtain means communicating with the chamber through which the eversion tube slides and by providing inflatable means, preferably one on each side of the curtain means, which when inflated is caused to press against the curtain means, thereby to press the curtain means against the eversion tube sliding therethrough so as to produce the seal which maintains the eversion pressure in the chamber. A pair of sets of such inflatable means may be mounted on the apparatus one above the other with the individual sets of inflatable means being individually controlled, thus producing not only redundancy of the sealing means but also permitting enlarged or discontinuous portions of the eversion tube assembly to pass through the sealing means without interfering with the seal produced thereby. The inflatable means are mounted on the apparatus in an exposed position, facilitating repair and replacement.
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patent: 5154936 (1992-10-01), Driver et al.
Corbin David H.
Insituform (Netherlands) B.V.
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